Screen



Aug. 2l, 1934 c. v. HALLENBECK SCREEN Filed Aug. 9, 1952 2 Sheets-Sheet l O O O O O 0 0 0 O O O |O\0.0|O. OIOIOD @ooo @obb INVENTOR.

` I l I l I Il ATTORNEYS Aug. 21, 1934. c. v. HALLENBECK SCREEN Filed Aug.A 9, 1952 2 Sheets-Sheet 2 ATTORNEYS Patented Aug. 21, 1934 rarer oFFlcE UNITED STATES I S .be accuratelyand completely separated according to their sizes by a simple gyratory action.

Another object is to provide in apparatus of this character, an adjustable resilient element which expedites the separative action upon may1I terial .under treatment and which may be addusted to varysaidaction in accordance with the `nature of the material. p

A further object istoprovide in conjunction with the screen-element, means to deliver the separated sizes, in regulatable quantities, and still other objects reside in details of construction and innovel arrangements and combinations of .partsas will be clearly brought outin the course of the following description.

. In the accompanying drawings, in the several views of which like parts aresimilarly designated,

Figure 1 is a partially 'broken plan view of an apparatus embodying the distinctive features of the present invention,

VFigure 2 is a vertical section taken on the line 2-2 of Figure 1,

Figure 3 is avsectional elevation of the screen- Ting-.element yof the apparatus showing a modified method of supporting and operating the same,

Figure 4 is a fragmentary section in the plane indicatedby the line 4 4 in Figure v2 and drawn Ato va larger scale, and

.Figures 5 and 6 are outline views of the screening-element, showing different methods of sup- .35 iporting-the same, tdeffect movement of the ma- ,.terial under treatment in different directions.

i Thescreening-element above referred to comprises a preferable rectangular box 5 containing three screens 6, 7 and 8 of differing meshes. The

.40 screens extend between the sides of the box and from an end of the -same toward the opposite end from which they are spaced at different lengths `order to discharge their respective oversizes and undersizes separate from each other. The .screen-box 'slants toward its discharge end and it movably supported at an end`by'a shaft 9 adapted to impart a gyratory movement to the "box, and at its opposite end by a pair `of leaf- .springs 10.

The shaft which is mounted for rotation in boxes 12 projecting from a cross-bar 13 of a supportingframe 14v of suitable construction, has, as bestshown in Figure 4, two eccentric parts 15, each .carrying one of two component members of Y ...ball bearings, .as at 16.

'I'he opposite members 17 of the ball bearings are fastened'inside a tube 18 which by means of brackets 19 i's secured atthe upper end of the screen-box. The tube is to this end provided with anged heads 20 to which the `brackets are fastened by means of bolts 2l. balls 22 engaging in grooves of the members of the ball bearings by which the tube is mounted uponrthe eccentrics ofthe shaft, provide for a substantially frictionless movement of the eccentrics relative to the tube.

In order to exclude'dirt and dust from the bearings, .the `ends of the tube are closedby means of retaining rings 23 engaging the respective members 17` of the ball-bearings, closure plates 24 partially spaced fromV the respective rings, and packings 25 of vsuitable material held between the rings and the plates, Ain engagement with the respective eccentrics. Bolts 26 connect the ring andthe plate at each end of the tube with the heads 20 of the same.

It will be apparent that by rotation of the shaft, a lengthwise gyratory ymotion is `imparted to the screen box. This motion is yieldingly opposed by the two leaf springs at the opposite ends of the box and it is a distinctive feature of the in- Yvention that thesprings are adjustable so as to vary the effect-of the gyratory motion of the box rupon material supported by the screens thereof.

The multiple plate leaf springs are for this Two series of.

purpose provided at their lower ends with semicircular feet 27 which rest in correspondingly formed chairs 28 on the supporting vframe of the apparatus. Bolts -29 secure the ends of the springs in their adjusted positions on the frame, and it will be readily apparent that by loosening the bolts, the ends of the springs may be turned .in the seats of the chairs whereby to vary the angularity of the springs relative tothe perpendicular. The .upper ends of the springs are pivotally connected at the vsides of the box, as at 30, and the springs are bent to be continually under tension.

In the operation of the screening-element, the gravel, sand or other material is fed upon the upper or coarser screen 6 which is longer than the others. The vibratory motion of the box causes the undersize of the material to fall through the meshes of the` screen 6 upon the next following screen 7 which is of intermediate size of the material on the intermediate screen falls upon the iinest or lower screen 8, where a third undersize is sifted from the material, while the oversizes of both the'intermediate and lower screens move toward and across the free ends of the screens.

A chute 31 divided into two compartments, 32 and 33, by a partition 34, conveys the oversizes discharged from the screens 7 and 8 into receiver 35, and the oversize of the upper screen and the undersze of the lower screen fall into the same receiver at opposite sides of the chute. The lower end portions of the sides of the chute and of the partition 34, divide the interior of the receiver into separated compartments.

The receiver has in its bottom, openings separately connected with the compartments, which may be closed by suitable gates 36 and it is to be understood that by proper manipulation of the gates, the various sizes of the material contained in the receiver, may be discharged in any desired porportions as may be required in preparing a mix for road-surfacing or other constructive or engineering work.

As stated hereinbefore, the action of the gyratory motion of the screen--box upon the material on the several screens thereof, may Vbe varied by adjustment of the springs 10. The larger the angle of the spring is with relation to theperpendicular, the more severe the action will-be` upon the material. If the springs slant at a comparative small angle from the perpendicular, as for example, in the construction shown in the drawings, the material will be subjected to a comparatively mild or sifting action, but by increasing the angle, the screening action becomes more severe and it causes a more vigorous up and downward movement of the particles in the material, resulting inl a beating or concussive movement which tends to break up clods in the material and separate the particles of gumm orsticky substances.

It will thus be seen that by simple adjustment of the springs the machine is readily adapted for sizing materials of different characters and conditions, either dry or wet.

When, in the operation, the screen box is gyrated by rotation of the eccentrics, its spring-- supported end moves in .an arc of-which each spring is a radius. As stated hereinbefore, the springs are connected under tension so that they will be pulling against the eccentrics at all times. t is preferred not to pass the rest point of the springs in the movement of the screen box, but have all the tension of the springs in one direction in order that the eccentrics may be under pressure at all times, thereby preventing whipping of the eccentrics.

In the modied construction illustrated in Figure 3, the screen-box is supported at both ends by means of tensioned leaf-springs 37 and 38 and the reciprocating motion of,Y the box is effected through the instrumentality of two pitmen 39 which connect with the eccentrics on the shaft 9. The two pairs of springs may be in parallel relation to each other as shown in the drawings, or they may be adjusted to extend at different angles relative to the perpendicular to still further vary the action of the movement of the box upon the material passing over the screens thereof.

When the springs are adjusted to different angles, either the lengths of the pitmen 39 must be changed or the position of the chairs 28 must be varied. 'Ihe rst stated expedient has been shown in the drawings, in which the pitmen are ,man adjustable to composed of two lapping sections connected by bolts 39a in slots 39C.

Instead of supporting the box upon the'springs, it may be suspended from the same as has been shown at 40 in Figure 5, and by reversing the angle of inclination of the springs relative to the perpendicular passing through their fixed ends, as shown in Figure 6, the material may be caused to move in the opposite direction, or as indicated by thevarrow, toward the upper end of the box. Under this condition the screens are arranged so that their free ends are spaced from the upper end of the box, to deliver the various sizes separately into the receiver as before.

Other changes in the construction and arrangement of the several parts and elements comprised in the apparatus may be resorted to without departing from the spirit of the invention as herein defined.

' What I `claim and desire to secure by Letters Patent is: n

, 1. Apparatus of thejcharacter described, comprising a screen-box, a continuously tensioned leaf spring supporting the box at an end thereof,

the opposite end of the spring being mounted for rotary adjustment thereof, `and mechanism to impart a gyratory movement to the box.

2. Apparatus of the character described, comprising a yscreen-box, a leaf-spring inclined from jth'e perpendicular and supporting the box at an prising a screen-box, a leaf-spring pivotally connected at one end, with the box and having an arcuate foot at its opposite end, a relatively stationary chair supporting the foot for rotary adjustment, means for fixing the foot in adjusted lis positions, and mechanism for imparting a vibratory movement to the box.

5. Apparatusof the character described, comprising a screen-box, leaf-springs inclined from the perpendicular and supporting the box at its ends, 'means for rotatably adjusting said springs and holding them at selective angles relative to the perpendicular, and mechanism to impart a vibratory movement to the box, including a pitvary the intensity of said movement. 1 Y

'6. Apparatusof the character described, comprising a screen-box, leaf-springs inclined from the perpendicular and supporting the box at its ends, means for rotatably adjusting said springs Yand for holding the springs at selective angles' relative to the perpendicular, and mechanism to impart a vibratory movement to the box, including a pitman pivotally connected to the box and adjustable to vary the intensity of said movetensioned spring slanting from the perpendicular of, the opposite end of the spring being mounted for rotary adjustment thereof, and mechanism adjacent the opposite end of said box and cooperative wth said spring to impart a gyratory movement to the box.

CHARLES V. HALLENBECK. 

